XS Scuba Companion Travel BCDCompanion BC By adding a compact wing to the Pony Pac, you have the Companion BC, an ultra compact travel BC. The Companion BC is 40% lighter than traditional BCs weighing in at only 5 lbs (2. 3 kg). Two way adjustable sternum strap. Extra large thumb loops for cinching down shoulder straps. Both the torso adjustable and sternum straps are equipped with squeeze style side release buckles. The waist strap is a cummerbund design with a hook and loop